Late glacial retreat of the Lancaster Sound Ice Stream and early Holocene onset of Arctic/Atlantic throughflow in the Arctic Island channels

Kelleher, Robert; Jennings, Anne E.; Andrews, John T.; Brooks, Nicole K. S.; Marchitto, Tom; Feng, Shaoting; Woelders, Lineke; Normandeau, Alexandre; Jenner, K A; Bennett, R; Brookins, Sarah

doi:10.1080/15230430.2022.2110689

Cited by 7 publications

(1 citation statement)

References 118 publications

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“…ka BP; Simon et al 2014), for which an increased advection of Atlantic waters has also been proposed as a triggering mechanism (Andrews et al 1998;Simon et al 2014). BBDC layers have been identified in numerous sediment cores from Baffin Bay continental slope and central basin sites by elevated Ca/ Sr ratios and/or high dolomite contents (Andrews et al 2014;Jackson et al 2017;Kelleher et al 2022) or elevated Ca/Ti ratios (Jenner et al 2018). Neither of these characteristics is evident from our data (see Fig.…”

Section: Palaeoenvironmental Reconstructionsmentioning

confidence: 49%

The deglaciation of Upernavik trough, West Greenland, and its Holocene sediment infill: processes and provenance

Weiser

Titschack

Hebbeln

2023

Boreas

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Under glacial climates, continental ice sheets such as, e.g., the Greenland Ice Sheet, extended onto the continental shelves and often carved out deep cross-shelf troughs. The sedimentary infill of such troughs commonly is a product of the complex interactions between the ice sheets, largely driving sediment input into the ocean, and the surrounding water masses. Off West Greenland, research has focused on the Disko and Uummannaq troughs, leaving the northerly adjacent Upernavik trough relatively understudied. Hence, neither the chronology of deglaciation nor the details of its postglacial infill are sufficiently well understood. Here, we combine computed tomography image-derived information with geochemical and granulometric data from four sediment cores recovered from the Upernavik trough that point to (i) deglaciation of the mid-shelf probably around 13.4 cal. ka BP that was most likely driven by a northward advection of warmer Atlantic waters during the Bølling-Allerød, (ii) the presence of widespread mass wasting around 8 cal. ka BP on the inner shelf and (iii) the complex interplay between various modes of sediment input, transport and deposition under hemipelagic sedimentation afterwards. While this interplay complicates provenance studies, we identify two major sediment delivery mechanisms that control transport and deposition from four sediment source areas. Through the Early Holocene the relative contributions of sediments from the various sources changed from a predominantly local origin to more southerly sources, mainly driven by decreasing input from the local sources. The integration of relative sediment source contributions with varying sedimentation rates challenges previous studies postulating intensified sediment delivery from the south through a greater influence of the West Greenland Current and highlights the need for the integration of sediment input and transport mechanisms into provenance studies in the area.

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Section: Palaeoenvironmental Reconstructionsmentioning

confidence: 49%

The deglaciation of Upernavik trough, West Greenland, and its Holocene sediment infill: processes and provenance

Weiser

Titschack

Hebbeln

2023

Boreas

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Rock avalanches in northeastern Baffin Island, Canada: understanding low occurrence amid high hazard potential

Matthew,

Gosse,

Hermanns

et al. 2024

Landslides

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Rock avalanches in fjord environments can cause direct catastrophic damage and trigger secondary submarine landslides and tsunamis. These are well-documented in Greenland, Norway, and Alaska but have gone largely unreported in the extensive fjord terrain of the eastern Canadian Arctic. We provide the first inventory of rock avalanche deposits in northeastern Baffin Island—a region characterized by moderate to high seismic hazard, steep and high-walled fjords and glacial valleys, active deglaciation, and observed climate warming. Over a broad study area of ~60,000 km2, one sixth of the terrain had sufficient slope height and gradient to potentially generate rock avalanches. Within that hazard zone, we identified eight rock avalanche deposits at six locations. Only three rock avalanche deposits at two locations are dated, using aerial imagery (1958-present), to the last century while five deposits at four locations are inferred as syn- to post-glacial, likely occurring shortly after local debuttressing. These total numbers fall well below documented inventories from Greenland, Norway, and Alaska. We hypothesize that (1) continuous permafrost persists throughout this region and continues to act as a stabilizing factor and (2) rock mass quality is high in areas of most extreme relief contrast within the study region relative to analogous high-latitude fjord systems such as those in southwestern Greenland. We suggest that Baffin Island is currently in a period of quasi-stability that follows the intense instability during initial deglaciation, yet precedes the higher anticipated slope instability that may occur during permafrost degradation.

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Chronology of detrital carbonate events in Baffin Bay reveals different timing but similar average recurrence time of North American-Arctic and Laurentide ice sheet collapse events during MIS 3

Jackson

Frederichs

Schulz

et al. 2023

Earth and Planetary Science Letters

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Late glacial retreat of the Lancaster Sound Ice Stream and early Holocene onset of Arctic/Atlantic throughflow in the Arctic Island channels

Cited by 7 publications

References 118 publications

The deglaciation of Upernavik trough, West Greenland, and its Holocene sediment infill: processes and provenance

The deglaciation of Upernavik trough, West Greenland, and its Holocene sediment infill: processes and provenance

Rock avalanches in northeastern Baffin Island, Canada: understanding low occurrence amid high hazard potential

Chronology of detrital carbonate events in Baffin Bay reveals different timing but similar average recurrence time of North American-Arctic and Laurentide ice sheet collapse events during MIS 3

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